html,
body,
#app {
  height: 360px;
  width: 280px;
  margin: 0px;
  padding: 20px 0px;
  font-family: Helvetica Neue,Helvetica,PingFang SC,Hiragino Sans GB,Microsoft YaHei,SimSun,sans-serif;
}
#content {
  margin: 10px;
  padding: 10px;
  text-align: center;
}
#content input {
  display: inline-block;
  width: 44px;
}
.btn {
  display: inline-block;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  background: #fff;
  border: 1px solid #dcdfe6;
  color: #606266;
  text-align: center;
  box-sizing: border-box;
  outline: none;
  margin: 0;
  transition: .1s;
  font-weight: 500;
  padding: 12px 20px;
  font-size: 14px;
  border-radius: 4px;
  width: initial!important;
}
#handle {
  color: #fff;
  background-color: #409eff;
  border-color: #409eff;
}
#handle:hover,#handle:focus {
  background: #66b1ff;
  border-color: #66b1ff;
  color: #fff;
}
#handle:active {
  background: #3a8ee6;
  border-color: #3a8ee6;
  color: #fff;
}

#stop:hover,#stop:focus {
  background: #f78989;
  border-color: #f78989;
  color: #fff;
}
#stop:active {
  background: #dd6161;
  border-color: #dd6161;
  color: #fff;
}
#stop {
  color: #fff;
  background-color: #f56c6c;
  border-color: #f56c6c;
}
.note {
  position: absolute;
  bottom: 0;
  margin-bottom: 20px;
}
.err-msg {
  color: red;
}
#log-area ul {
  height: 120px;
  overflow-y: auto;
}
#log-area {
  text-align: left;
  margin-top: 10px;
}